Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1999-04-15
2000-10-24
Pezzuto, Robert E.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
91317, E21B 414
Patent
active
061352160
ABSTRACT:
A sealing and venting system including an improved piston is for a drill assembly. The drill assembly includes a fluid distributor within the casing with an elongated guide portion having an outer surface, a passage through the guide portion and a port between the outer surface and the passage. The improved piston is slidable within the casing and has an interior surface disposeable about the outer surface of the guide portion. A valve chamber, an exhaust chamber and a drive chamber are defined within the casing. The system includes a sealing surface disposed within the piston passage and slidably engageable with the outer surface of the guide portion to provide a seal between the piston and the distributor. The sealing surface prevents fluid communication between the drive chamber and the exhaust chamber when the sealing surface engages the outer surface of the guide portion, and is provided by an interior surface section of the piston body or by a separate ring seal. Further, an exhaust passage is defined by sections of the interior surface of the piston and of the outer surface of the guide portion when the guide portion is disposed within the piston passage, the passage extending between the sealing surface and the second end of the piston. The exhaust passage establishes fluid communication between the valve chamber and the exhaust chamber through the distributor and piston passages when the sealing surface engages the outer surface of the guide portion on one side of the distributor port.
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patent: 5562170 (1996-10-01), Wolfer et al.
patent: 5566771 (1996-10-01), Wolfer et al.
patent: 5711205 (1998-01-01), Wolfer et al.
Lyon Leland H.
Smith Richard K.
Ingersoll-Rand Company
Pezzuto Robert E.
Ussai Mark A.
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